package com.puff.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.puff.constant.MessageConstant;
import com.puff.constant.PasswordConstant;
import com.puff.constant.StatusConstant;
import com.puff.context.BaseContext;
import com.puff.dto.EmployeeDTO;
import com.puff.dto.EmployeeLoginDTO;
import com.puff.dto.EmployeePageQueryDTO;
import com.puff.dto.EmplyeeEditPasswordDTO;
import com.puff.entity.Employee;
import com.puff.exception.AccountLockedException;
import com.puff.exception.AccountNotFoundException;
import com.puff.exception.PasswordErrorException;
import com.puff.mapper.EmployeeMapper;
import com.puff.result.PageResult;
import com.puff.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();
        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);
        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }
        //密码比对
        //将前端传过来的明文密码通过md5加密，转化为密文的形式与数据库密码进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }
        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }
        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();

        //对象属性拷贝
        BeanUtils.copyProperties(employeeDTO,employee);

        //设置账号状态
        employee.setStatus(StatusConstant.ENABLE);

        //设置默认密码：123456
        employee.setPassword(DigestUtils.md5DigestAsHex
                (PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //设置创建时间和修改时间
        //employee.setCreateTime(LocalDateTime.now());
        //employee.setUpdateTime(LocalDateTime.now());

        //设置创建人id和修改人id
        //employee.setCreateUser(BaseContext.getCurrentId());
        //employee.setUpdateUser(BaseContext.getCurrentId());

        //调用mapper层
        employeeMapper.insert(employee);
    }

    /**
     * 员工分页查询
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        // 利用PageHelper进行分页查询的参数计算
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());

        // 动态获取查询条件（员工名称），进行条件查询
        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);

        // 获取记录数和数据并返回
        long total = page.getTotal();
        List<Employee> records = page.getResult();

        return new PageResult(total,records);
    }

    /**
     * 启用禁用员工账号
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        // 使用动态SQL的方式进行修改，便于后边代码的编写
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();

        employeeMapper.update(employee);
    }

    /**
     * 根据id查询员工信息
     * @param id
     * @return
     */
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id);

        // 不返回显示的密码
        employee.setPassword("******");
        return employee;
    }

    /**
     * 编辑员工信息
     * @param employeeDTO
     */
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        // 对象属性复制
        BeanUtils.copyProperties(employeeDTO,employee);

        // 设置修改人和修改时间
        //employee.setUpdateTime(LocalDateTime.now());
        //employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.update(employee);
    }

    /**
     * 修改密码
     * @param emplyeeEditPasswordDTO
     */
    public void editPassword(EmplyeeEditPasswordDTO emplyeeEditPasswordDTO) {
        String username = emplyeeEditPasswordDTO.getUsername();
        String oldPassword = emplyeeEditPasswordDTO.getOldPassword();
        String newPassword = emplyeeEditPasswordDTO.getNewPassword();

        // 根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //密码比对
        //e10adc3949ba59abbe56e057f20f883e
        //将前端传过来的明文密码通过md5加密，转化为密文的形式与数据库密码进行比对
        oldPassword = DigestUtils.md5DigestAsHex(oldPassword.getBytes());
        if (!oldPassword.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        Employee newEmployee = new Employee();
        BeanUtils.copyProperties(emplyeeEditPasswordDTO,newEmployee);

        newPassword = DigestUtils.md5DigestAsHex(newPassword.getBytes());
        newEmployee.setPassword(newPassword);
        newEmployee.setId(employee.getId());
        employeeMapper.update(newEmployee);
    }

}
